According to producer/writer Simon Kinberg, "some of the original cast" will be involved in X-Men: Apocalypse.

Let's discuss who we want to see, and speculate who they will bring back.

Obviously, Jackman will be back as Wolverine in the past, since it's set in the 80s, so the option above is for Jackman as the future version.

Also, I didn't put Blink, Sunspot, Warpath and Bishop in the poll as they aren't Original Trilogy cast, but we can talk about them in the posts below if you want them back, and nor did I include the First Class past cast - either the earlier ones (Banshee, Havok, Emma) or the new ones (Quicksilver, Toad, Ink, 'Spyke' or whoever it was).